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EP0809403A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Shared hybrid fiber-coax network having reduced ingress noise

Assignee: AT&T Inc
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Filing: 1997-05-20
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Granted: —
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Expires: 2017-05-20
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Abstract

Abstract A hybrid fiber-coax network (100) includes at least one repeater (2201) dispersed within a coax trunk (221) that carries video information downstream to a subscriber (14) and subscriber-originated information upstream to a fiber node (18). The repeater serves to digitally regenerate the subscriber-originated information to reduce ingress noise that would otherwise aggregate at the fiber node. <IMAGE>

Inventors

  • 👤 James E. Dail

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 02:28
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/12; H04H20/65; H04H20/76; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4917; H04L25/4919; H04L25/4921; H04L27/00; H04L27/26; H04L27/2601; H04N; H04N7/00; H04N7/10; H04N7/102; H04N7/16; H04N7/173; H04N7/17309

Claims Analysis

Total Claims: 40
Claim 1
Independent Claim 57 words
A hybrid fiber-coax network for carrying information from a head end downstream to at least one subscriber and for carrying subscriber-originated information upstream from said one subscriber to said head end via at least one trunk coax, the improvement comprising a repeater for converting the upstream information into a digital format and then digitally regenerating said information
Claim 2
Dependent Claim 21 words
The hybrid fiber-coax network according to claim 1 wherein the network includes a plurality of repeaters dispersed along the trunk coax.
Claim 3
Dependent Claim 29 words
The hybrid fiber-coax network according to claim 1 wherein the network includes at least one upstream amplifier and wherein at least one repeater is housed with the upstream amplifier.
Claim 4
Dependent Claim 30 words
The hybrid fiber-coax network according to claim 1 wherein the network includes at least one upstream amplifier and wherein at least one repeater is housed adjacent to the upstream amplifier.
Claim 5
Dependent Claim 19 words
The hybrid fiber-coax network according to claim 1 wherein said repeater regenerates subscriber-originated information within a predefined frequency range.
Claim 6
Dependent Claim 28 words
The hybrid fiber-coax network according to claim 1 wherein the subscriber-originated information is re-generated and re-multiplexed into the same spectrum as the subscriber-originated information on the trunk coax.
Claim 7
Dependent Claim 21 words
The hybrid fiber-coax network according to claim 1 wherein the repeater shifts the regenerated signal in spectrum from the input signal.
Claim 8
Dependent Claim 21 words
The hybrid fiber-coax network according to claim 1 wherein the repeater shifts the regenerated signal in time from the input signal.
Claim 9
Dependent Claim 31 words
The hybrid fiber-coax network according to claim 1 wherein the repeater extracts the subscriber-originated signals not with a first prescribed bandwidth and recombines such signals with said digitally regenerated subscriber information.
Claim 10
Dependent Claim 32 words
The hybrid fiber-coax network according to claim 1 wherein the repeater regenerates digital subscriber-originated information within a first prescribed bandwidth and blocks signals within said first prescribed bandwidth not allocated another repeater.
Claim 11
Dependent Claim 26 words
The hybrid fiber coax network according to claim 1 wherein the repeater only regenerates subscriber-originated information when such information is properly detected on the coax trunk.
Claim 12
Dependent Claim 18 words
The hybrid fiber-coax network according to claim 11 wherein the information is detected in accordance with its level.
Claim 13
Dependent Claim 20 words
The fiber-coax network according to claim 11 wherein the information is detected in accordance with its preamble and clock signal.
Claim 14
Dependent Claim 20 words
The hybrid fiber-coax network according to claim 11 wherein the information is detected in accordance with a valid error rate.
Claim 15
Dependent Claim 21 words
The hybrid fiber-coax network of claim 1 wherein the repeater regenerates subscriber information at a level proportional to its input level.
Claim 16
Dependent Claim 19 words
The hybrid fiber-coax network according to claim 1 including multiple repeaters for re-generating subscriber-originated information in multiple frequency bands.
Claim 17
Dependent Claim 30 words
The hybrid fiber-coax network of claim 1 wherein the repeater blocks information that is not properly detected and a valid level and format signal containing information about such blocked information.
Claim 18
Dependent Claim 95 words
The hybrid fiber-coax network according to claim 1 wherein the repeater comprises: an analog-to-digital converter for digitizing the subscriber-originated information; a digital filter for passing information within a preselected frequency band; means for demodulating the information within the preselected band; a receiver having a prescribed modulation format for receiving the demodulated information a transmitter having the same prescribed modulation format as the receiver for transmitting the received information; a modulator for modulating the transmitted information; and a diplexer for separating and combining the upstream and downstream information, respectively, from and to, respectively, the trunk coax.
Claim 19
Independent Claim 62 words
A method for reducing ingress noise in a shared fiber-coax network that carries information from a head end to at least one subscriber via at least one main coax trunk and for carrying subscriber-originated information, via said one coax branch trunk to said head end, the method comprising the steps of: digitizing the subscriber-originated information; and digitally regenerating the digitized subscriber-originated information.
Claim 20
Dependent Claim 77 words
The method according to claim 19 wherein the step of regenerating the subscriber-originated information includes the steps of: filtering the digitized subscriber-originated information to pass the information in a preselected band; demodulating the information within the preselected band; receiving the demodulated information via a receiver having a prescribed modulation format transmitting the information received by the receiver in accordance with said prescribed modulation format; modulating the transmitted information; and injecting the transmitted information into the trunk coax.
Claim 21
Dependent Claim 24 words
The method according to claim 19 wherein the filtering step includes the step of bypassing subscriber-originated information that is not within the preselected band.
Claim 22
Dependent Claim 40 words
The method according to claim 19 wherein the filtering step includes the step of blocking information within the preselected band for non-regeneration to allow use of such information by a second repeater without adding any noise at said second repeater.
Claim 23
Dependent Claim 16 words
The method according to claim 20 wherein the prescribed modulation format is Quadrature Phase Shift Keying.
Claim 24
Dependent Claim 15 words
The method according to claim 20 wherein the prescribed modulation format is Quadrature Amplitude Modulation.
Claim 25
Dependent Claim 15 words
The method according to claim 20 wherein the prescribed modulation format is Carrierless Amplitude Modulation.
Claim 26
Dependent Claim 14 words
The method according to claim 20 wherein the prescribed modulation format is Digital Multi-Tone.
Claim 27
Dependent Claim 15 words
The method according to claim 20 wherein the prescribed modulation format is Digital Wavelet Multi-Tone.
Claim 28
Dependent Claim 16 words
The method according to claim 19 wherein the subscriber-originated information is regenerated in multiple frequency bands.
Claim 29
Dependent Claim 30 words
The method according to claim 19 wherein the subscriber-originated information is regenerated by receiving the information via a single receiver and then transmitting the received information via a single transmitter.
Claim 30
Dependent Claim 28 words
The method according to claim 19 wherein the subscriber-originated information is regenerated by receiving the information with multiple receivers and then transmitting the information via multiple corresponding transmitters.
Claim 31
Dependent Claim 17 words
The method according to claim 19 wherein the subscriber-originated information is regenerated at a preset output level.
Claim 32
Dependent Claim 25 words
The method according to claim 19 wherein the subscriber-originated information is regenerated at an output level dependent on the input level of the received information.
Claim 33
Dependent Claim 29 words
The method according to claim 19 wherein the subscriber-originated information is regenerated in a particular frequency band in at least one time slot associated with said main coax trunk.
Claim 34
Dependent Claim 30 words
The method according to claim 19 wherein the subscriber-originated information is regenerated in a particular frequency band in time slots shared with multiple repeaters on at least one coax trunk.
Claim 35
Dependent Claim 21 words
The method according to claim 19 further including the step of utilizing downstream signal information for clock and framing reference purposes.
Claim 36
Dependent Claim 24 words
The method according to claim 19 wherein the digitally regenerated subscriber information passes on said coax and is digitally regenerated by a second repeater.
Claim 37
Dependent Claim 32 words
The method according to claim 19 wherein the said information having said preselected modulation format comprises a burst, multiple access signal and wherein said signal is converted into a continuous point-to-point signal.
Claim 38
Dependent Claim 23 words
The method according to claim 37 wherein the continuous point-to-point signal has a modulation format the same as said burst, multiple access signal.
Claim 39
Dependent Claim 23 words
The method according to claim 37 wherein the continuous point-to-point signal has a different same modulation format as said burst, multiple access signal.
Claim 40
Dependent Claim 33 words
The method according to claim 19 including the step of deriving a downstream signaling channel received by the repeater for the purpose of operations, performance monitoring, repeater configuration control and repeater software download

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